preheat an oven to 150 degrees Celcius or 300 Farenheit
In a bowl mash the banana and mix it with the peanut butter, flax seeds, chia seeds, turmeric and cinnamon.
Once that has been mixed well you can chop the walnuts (or other nuts like pecans) and add the remaining ingredients.
Now line a baking dish with a piece of parchment paper and fill it with the mixture.
Flatten it and at this point you can cut them in your desired shapes.
Bake them for about 45 to 50 minutes (just make sure the top doesn't burn). When you take them out of the oven place them on a cooling rack to completely cool.
After they have cooled down completely store them in an air tight container.